Module: LCClasses

Defined in:
lib/lcclasses.rb

Defined Under Namespace

Classes: LCClass

Constant Summary collapse

CLASS_HASH =

Library of Congress Main Classes and Subclasses

{
  'A' => {
    :name => 'General Works',
    :subclasses => {
      'AC'   => { :name => 'Collections; Series; Collected works' },
      'AE'   => { :name => 'Encyclopedias' },
      'AG'   => { :name => 'Dictionaries and other general reference works' },
      'AI'   => { :name => 'Indexes' },
      'AM'   => { :name => 'Museums. Collectors and collecting' },
      'AN'   => { :name => 'Newspapers' },
      'AP'   => { :name => 'Periodicals' },
      'AS'   => { :name => 'Academies and learned societies' },
      'AY'   => { :name => 'Yearbooks. Almanacs. Directories' },
      'AZ'   => { :name => 'History of scholarship and learning. The humanities' }
    }
  },
  'B' => {
    :name => 'Philosophy, Psychology, Religion',
    :subclasses => {
      'B'    => { :name => 'Philosophy (General)' },
      'BC'   => { :name => 'Logic' },
      'BD'   => { :name => 'Speculative philosophy' },
      'BF'   => { :name => 'Psychology' },
      'BH'   => { :name => 'Aesthetics' },
      'BJ'   => { :name => 'Ethics' },
      'BL'   => { :name => 'Religions; Mythology; Rationalism' },
      'BM'   => { :name => 'Judaism' },
      'BP'   => { :name => 'Islam; Bahaism; Theosophy, etc.' },
      'BQ'   => { :name => 'Buddhism' },
      'BR'   => { :name => 'Christianity' },
      'BS'   => { :name => 'The Bible' },
      'BT'   => { :name => 'Doctrinal Theology' },
      'BV'   => { :name => 'Practical Theology' },
      'BX'   => { :name => 'Christian Denominations' }
    }
  },
  'C' => {
    :name => 'Auxiliary Sciences of History (General)',
    :subclasses => {
      'CB'   => { :name => 'History of Civilization' },
      'CC'   => { :name => 'Archaeology' },
      'CD'   => { :name => 'Diplomatics. Archives. Seals' },
      'CE'   => { :name => 'Technical Chronology. Calendar' },
      'CJ'   => { :name => 'Numismatics' },
      'CN'   => { :name => 'Inscriptions. Epigraphy' },
      'CR'   => { :name => 'Heraldry' },
      'CS'   => { :name => 'Genealogy' },
      'CT'   => { :name => 'Biography' }
    }
  },
  'D' => {
    :name => 'World History and History of Europe, Asia, Africa, Australia, New Zealand, etc.',
    :subclasses => {
      'D'    => { :name => 'History (General)' },
      'DA'   => { :name => 'Great Britain' },
      'DAW'  => { :name => 'Central Europe' },
      'DB'   => { :name => 'Austria - Liechtenstein - Hungary - Czechoslovakia' },
      'DC'   => { :name => 'France - Andorra - Monaco' },
      'DD'   => { :name => 'Germany' },
      'DE'   => { :name => 'Greco-Roman World' },
      'DF'   => { :name => 'Greece' },
      'DG'   => { :name => 'Italy - Malta' },
      'DH'   => { :name => 'Low Countries - Benelux Countries' },
      'DJ'   => { :name => 'Netherlands (Holland)' },
      'DJK'  => { :name => 'Eastern Europe (General)' },
      'DK'   => { :name => 'Russia. Soviet Union. Former Soviet Republics - Poland' },
      'DL'   => { :name => 'Northern Europe. Scandinavia' },
      'DP'   => { :name => 'Spain - Portugal' },
      'DQ'   => { :name => 'Switzerland' },
      'DR'   => { :name => 'Balkan Peninsula' },
      'DS'   => { :name => 'Asia' },
      'DT'   => { :name => 'Africa' },
      'DU'   => { :name => 'Oceania (South Seas)' },
      'DX'   => { :name => 'Gypsies' }
    }
  },
  'E' => {
    :name => 'History of America, United States'
  },
  'F' => {
    :name => 'Local History of the United States and British, Dutch, French, and Latin America'
  },
  'G' => {
    :name => 'Geography, Anthropology, Recreation',
    :subclasses => {
      'G'  => { :name => 'Geography (General). Atlases. Maps' },
      'GA' => { :name => 'Mathematical geography. Cartography' },
      'GB' => { :name => 'Physical geography' },
      'GC' => { :name => 'Oceanography' },
      'GE' => { :name => 'Environmental Sciences' },
      'GF' => { :name => 'Human ecology. Anthropogeography' },
      'GN' => { :name => 'Anthropology' },
      'GR' => { :name => 'Folklore' },
      'GT' => { :name => 'Manners and customs (General)' },
      'GV' => { :name => 'Recreation. Leisure' }
    }
  },
  'H' => {
    :name => 'Social Sciences',
    :subclasses => {
      'H'  => { :name => 'Social sciences (General)' },
      'HA' => { :name => 'Statistics' },
      'HB' => { :name => 'Economic theory. Demography' },
      'HC' => { :name => 'Economic history and conditions' },
      'HD' => { :name => 'Industries. Land use. Labor' },
      'HE' => { :name => 'Transportation and communications' },
      'HF' => { :name => 'Commerce' },
      'HG' => { :name => 'Finance' },
      'HJ' => { :name => 'Public finance' },
      'HM' => { :name => 'Sociology (General)' },
      'HN' => { :name => 'Social history and conditions. Social problems. Social reform' },
      'HQ' => { :name => 'The family. Marriage. Women' },
      'HS' => { :name => 'Societies: secret, benevolent, etc.' },
      'HT' => { :name => 'Communities. Classes. Races' },
      'HV' => { :name => 'Social pathology. Social and public welfare. Criminology' },
      'HX' => { :name => 'Socialism. Communism. Anarchism' }
    }
  },
  'J' => {
    :name => 'Political Sciences',
    :subclasses => {
      'J'  => { :name => 'General legislative and executive papers' },
      'JA' => { :name => 'Political science (General)' },
      'JC' => { :name => 'Political theory' },
      'JF' => { :name => 'Political institutions and public administration' },
      'JJ' => { :name => 'Political institutions and public administration (North America)' },
      'JK' => { :name => 'Political institutions and public administration (United States)' },
      'JL' => { :name => 'Political institutions and public administration (Canada, Latin America, etc.)' },
      'JN' => { :name => 'Political institutions and public administration (Europe)' },
      'JQ' => { :name => 'Political institutions and public administration (Asia, Africa, Australia, Pacific Area, etc.)' },
      'JS' => { :name => 'Local government. Municipal government' },
      'JV' => { :name => 'Colonies and colonization. Emigration and immigration. International migration' },
      'JX' => { :name => 'International law, see JZ and KZ (obsolete)' },
      'JZ' => { :name => 'International relations' }
    }
  },
  'K' => {
    :name => 'Law',
    :subclasses => {
      'K'       => { :name => 'Law in general. Comparative and uniform law. Jurisprudence' },
      'KB'      => { :name => 'Religious law in general. Comparative religious law. Jurisprudence' },
      'KBM'     => { :name => 'Jewish law' },
      'KBP'     => { :name => 'Islamic law' },
      'KBR'     => { :name => 'History of canon law' },
      'KBU'     => { :name => 'Law of the Roman Catholic Church. The Holy See' },
      'KD-KDK'  => { :name => 'United Kingdom and Ireland' },
      'KDZ'     => { :name => 'America. North America' },
      'KE'      => { :name => 'Canada' },
      'KF'      => { :name => 'United States' },
      'KG'      => { :name => 'Latin America - Mexico and Central America - West Indies. Caribbean area' },
      'KH'      => { :name => 'South America' },
      'KJ-KKZ'  => { :name => 'Europe' },
      'KL-KWX'  => { :name => 'Asia and Eurasia, Africa, Pacific Area, and Antarctica' },
      'KZ'      => { :name => 'Law of nations' }
    }
  },
  'L' => {
    :name => 'Education',
    :subclasses => {
      'L'  => { :name => 'Education (General)' },
      'LA' => { :name => 'History of education' },
      'LB' => { :name => 'Theory and practice of education' },
      'LC' => { :name => 'Special aspects of education' },
      'LD' => { :name => 'Individual institutions - United States' },
      'LE' => { :name => 'Individual institutions - America (except United States)' },
      'LF' => { :name => 'Individual institutions - Europe' },
      'LG' => { :name => 'Individual institutions - Asia, Africa, Indian Ocean islands, Australia, New Zealand, Pacific islands' },
      'LH' => { :name => 'College and school magazines and papers' },
      'LJ' => { :name => 'Student fraternities and societies, United States' },
      'LT' => { :name => 'Textbooks' }
    }
  },
  'M' => {
    :name => 'Music',
    :subclasses => {
      'M'  => { :name => 'Music' },
      'ML' => { :name => 'Literature on music' },
      'MT' => { :name => 'Instruction and study' }
    }
  },
  'N' => {
    :name => 'Fine Arts',
    :subclasses => {
      'N'  => { :name => 'Visual arts' },
      'NA' => { :name => 'Architecture' },
      'NB' => { :name => 'Sculpture' },
      'NC' => { :name => 'Drawing. Design. Illustration' },
      'ND' => { :name => 'Painting' },
      'NE' => { :name => 'Print media' },
      'NK' => { :name => 'Decorative arts' },
      'NX' => { :name => 'Arts in general' }
    }
  },
  'P' => {
    :name => 'Language and Literature',
    :subclasses => {
      'P'  => { :name => 'Philology. Linguistics' },
      'PA' => { :name => 'Greek language and literature. Latin language and literature' },
      'PB' => { :name => 'Modern languages. Celtic languages' },
      'PC' => { :name => 'Romanic languages' },
      'PD' => { :name => 'Germanic languages. Scandinavian languages' },
      'PE' => { :name => 'English language' },
      'PF' => { :name => 'West Germanic languages' },
      'PG' => { :name => 'Slavic languages and literatures. Baltic languages. Albanian language' },
      'PH' => { :name => 'Uralic languages. Basque language' },
      'PJ' => { :name => 'Oriental languages and literatures' },
      'PK' => { :name => 'Indo-Iranian languages and literatures' },
      'PL' => { :name => 'Languages and literatures of Eastern Asia, Africa, Oceania' },
      'PM' => { :name => 'Hyperborean, Indian, and artificial languages' },
      'PN' => { :name => 'Literature (General)' },
      'PQ' => { :name => 'French literature - Italian literature - Spanish literature - Portuguese literature' },
      'PR' => { :name => 'English literature' },
      'PS' => { :name => 'American literature' },
      'PT' => { :name => 'Germanic, Scandinavian, and Icelandic literatures' },
      'PZ' => { :name => 'Fiction and juvenile belles lettres' }
    }
  },
  'Q' => {
    :name => 'Science',
    :subclasses => {
      'Q'  => { :name => 'Science (General)' },
      'QA' => { :name => 'Mathematics' },
      'QB' => { :name => 'Astronomy' },
      'QC' => { :name => 'Physics' },
      'QD' => { :name => 'Chemistry' },
      'QE' => { :name => 'Geology' },
      'QH' => { :name => 'Natural history - Biology' },
      'QK' => { :name => 'Botany' },
      'QL' => { :name => 'Zoology' },
      'QM' => { :name => 'Human anatomy' },
      'QP' => { :name => 'Physiology' },
      'QR' => { :name => 'Microbiology' }
    }
  },
  'R' => {
    :name => 'Medicine',
    :subclasses => {
      'R'  => { :name => 'Medicine (General)' },
      'RA' => { :name => 'Public aspects of medicine' },
      'RB' => { :name => 'Pathology' },
      'RC' => { :name => 'Internal medicine' },
      'RD' => { :name => 'Surgery' },
      'RE' => { :name => 'Ophthalmology' },
      'RF' => { :name => 'Otorhinolaryngology' },
      'RG' => { :name => 'Gynecology and obstetrics' },
      'RJ' => { :name => 'Pediatrics' },
      'RK' => { :name => 'Dentistry' },
      'RL' => { :name => 'Dermatology' },
      'RM' => { :name => 'Therapeutics. Pharmacology' },
      'RS' => { :name => 'Pharmacy and materia medica' },
      'RT' => { :name => 'Nursing' },
      'RV' => { :name => 'Botanic, Thomsonian, and eclectic medicine' },
      'RX' => { :name => 'Homeopathy' },
      'RZ' => { :name => 'Other systems of medicine' }
    }
  },
  'S' => {
    :name => 'Agriculture',
    :subclasses => {
      'S'  => { :name => 'Agriculture (General)' },
      'SB' => { :name => 'Plant culture' },
      'SD' => { :name => 'Forestry' },
      'SF' => { :name => 'Animal culture' },
      'SH' => { :name => 'Aquaculture. Fisheries. Angling' },
      'SK' => { :name => 'Hunting sports' }
    }
  },
  'T' => {
    :name => 'Technology',
    :subclasses => {
      'T'  => { :name => 'Technology (General)' },
      'TA' => { :name => 'Engineering (General). Civil engineering' },
      'TC' => { :name => 'Hydraulic engineering. Ocean engineering' },
      'TD' => { :name => 'Environmental technology. Sanitary engineering' },
      'TE' => { :name => 'Highway engineering. Roads and pavements' },
      'TF' => { :name => 'Railroad engineering and operation' },
      'TG' => { :name => 'Bridge engineering' },
      'TH' => { :name => 'Building construction' },
      'TJ' => { :name => 'Mechanical engineering and machinery' },
      'TK' => { :name => 'Electrical engineering. Electronics. Nuclear engineering' },
      'TL' => { :name => 'Motor vehicles. Aeronautics. Astronautics' },
      'TN' => { :name => 'Mining engineering. Metallurgy' },
      'TP' => { :name => 'Chemical technology' },
      'TR' => { :name => 'Photography' },
      'TS' => { :name => 'Manufactures' },
      'TT' => { :name => 'Handicrafts. Arts and crafts' },
      'TX' => { :name => 'Home economics' }
    }
  },
  'U' => {
    :name => 'Military Science',
    :subclasses => {
      'U'  => { :name => 'Military science (General)' },
      'UA' => { :name => 'Armies: Organization, distribution, military situation' },
      'UB' => { :name => 'Military administration' },
      'UC' => { :name => 'Maintenance and transportation' },
      'UD' => { :name => 'Infantry' },
      'UE' => { :name => 'Cavalry. Armor' },
      'UF' => { :name => 'Artillery' },
      'UG' => { :name => 'Military engineering. Air forces' },
      'UH' => { :name => 'Other services' }
    }
  },
  'V' => {
    :name => 'Naval Science',
    :subclasses => {
      'V'  => { :name => 'Naval science (General)' },
      'VA' => { :name => 'Navies: Organization, distribution, naval situation' },
      'VB' => { :name => 'Naval administration' },
      'VC' => { :name => 'Naval maintenance' },
      'VD' => { :name => 'Naval seamen' },
      'VE' => { :name => 'Marines' },
      'VF' => { :name => 'Naval ordnance' },
      'VG' => { :name => 'Minor services of navies' },
      'VK' => { :name => 'Navigation. Merchant marine' },
      'VM' => { :name => 'Naval architecture. Shipbuilding. Marine engineering' }
    }
  },
  'Z' => {
    :name => 'Bibliography, Library Science',
    :subclasses => {
      'Z'   => { :name => 'Books (General). Writing. Paleography. Book industries and trade. Libraries. Bibliography' },
      'ZA'  => { :name => 'Information resources (General)' }
    }
  }
}.freeze

Class Method Summary collapse

Class Method Details

.find_all_by_code(code) ⇒ Object

Find all main classes and subclass that match or start with a code or character.



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# File 'lib/lcclasses.rb', line 414

def self.find_all_by_code(code)
  LCClasses.flat.select { |i| i[0] if i[0] =~ /^#{code}[A-Z]?[A-Z]?/ }
end

.find_by_code(code) ⇒ Object 



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# File 'lib/lcclasses.rb', line 399

def self.find_by_code(code)
  LCClasses.flat.detect { |i| i[0] == code.to_s }
end

.find_main_class_by_code(code) ⇒ Object

Find an main classe by code.



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# File 'lib/lcclasses.rb', line 404

def self.find_main_class_by_code(code)
  LCClasses.main_classes.detect { |i| i[0] == code.to_s }
end

.find_subclass_by_code(code) ⇒ Object

Find a subclass by code.



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# File 'lib/lcclasses.rb', line 409

def self.find_subclass_by_code(code)
  LCClasses.subclasses.detect { |i| i[0] == code.to_s }
end

.flat ⇒ Object

All main classes and subclasses in a flat array.



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# File 'lib/lcclasses.rb', line 395

def self.flat
  LCClasses::LCClass.flatten(LCClasses::CLASS_HASH)
end

.main_classes ⇒ Object

An array of main LC Classes.



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# File 'lib/lcclasses.rb', line 376

def self.main_classes
  CLASS_HASH.map do |k, v|
    LCClasses::LCClass[k, v[:name]]
  end.sort
end

.nested ⇒ Object

A nested array of main classes and subclasses.



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# File 'lib/lcclasses.rb', line 390

def self.nested
  LCClasses::LCClass.nest(LCClasses::CLASS_HASH)
end

.subclasses ⇒ Object

An array of all LC Subclasses.



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# File 'lib/lcclasses.rb', line 383

def self.subclasses
  self.main_classes.inject([]) do |result, main_class|
    result + main_class.subclasses
  end
end